Report bugs found in TunerPro. Please be sure to include as much info as possible, including system specs, OS, repro steps and TunerPro version number.
The crashing is most likely a sign of an error message not being handled correctly (I suspect it is probably a failure to report an attempt to import an unsupported format is being attempted). TunerPro will only import .ecu and .csv definition files for conversion to a .xdf file.